[New cygwin version] cygwin-3.6.0

[github-actions]

Cygwin 3.6.0 release

https://github.com/cygwin/cygwin/releases/tag/cygwin-3.6.0

[dscho]

The MSYS2 PR is here: msys2/msys2-runtime#260

[dscho]

The Git for Windows PR is here: git-for-windows/msys2-runtime#89

[dscho]

/add relnote

The workflow run was started

[dscho]

We will need to keep an eye on msys2/msys2-runtime#270.